docs: def quote(key, value):
      """Certain options support string values. We want clients to be able to pass Python strings in
      but we need them to be quoted in the output. Unfortunately some of those options also allow
      numbers so we type check the value before wrapping it in quotes.
      """
  
      if key in quoted_options and isinstance(value, string_types):
          return "'%s'" % value
  
      if key in quoted_bool_options and isinstance(value, bool):
          return {True:'true',False:'false'}[value]
  
      return value